14x^2+11x-20=0

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Solution for 14x^2+11x-20=0 equation:


Simplifying
14x2 + 11x + -20 = 0

Reorder the terms:
-20 + 11x + 14x2 = 0

Solving
-20 + 11x + 14x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
14 the coefficient of the squared term: 

Divide each side by '14'.
-1.428571429 + 0.7857142857x + x2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + 0.7857142857x + 1.428571429 + x2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + 0.7857142857x + x2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + 0.7857142857x + x2 = 0 + 1.428571429
0.7857142857x + x2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
0.7857142857x + x2 = 1.428571429

The x term is 0.7857142857x.  Take half its coefficient (0.3928571429).
Square it (0.1543367347) and add it to both sides.

Add '0.1543367347' to each side of the equation.
0.7857142857x + 0.1543367347 + x2 = 1.428571429 + 0.1543367347

Reorder the terms:
0.1543367347 + 0.7857142857x + x2 = 1.428571429 + 0.1543367347

Combine like terms: 1.428571429 + 0.1543367347 = 1.5829081637
0.1543367347 + 0.7857142857x + x2 = 1.5829081637

Factor a perfect square on the left side:
(x + 0.3928571429)(x + 0.3928571429) = 1.5829081637

Calculate the square root of the right side: 1.258136783

Break this problem into two subproblems by setting 
(x + 0.3928571429) equal to 1.258136783 and -1.258136783.

Subproblem 1

x + 0.3928571429 = 1.258136783 Simplifying x + 0.3928571429 = 1.258136783 Reorder the terms: 0.3928571429 + x = 1.258136783 Solving 0.3928571429 + x = 1.258136783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3928571429' to each side of the equation. 0.3928571429 + -0.3928571429 + x = 1.258136783 + -0.3928571429 Combine like terms: 0.3928571429 + -0.3928571429 = 0.0000000000 0.0000000000 + x = 1.258136783 + -0.3928571429 x = 1.258136783 + -0.3928571429 Combine like terms: 1.258136783 + -0.3928571429 = 0.8652796401 x = 0.8652796401 Simplifying x = 0.8652796401

Subproblem 2

x + 0.3928571429 = -1.258136783 Simplifying x + 0.3928571429 = -1.258136783 Reorder the terms: 0.3928571429 + x = -1.258136783 Solving 0.3928571429 + x = -1.258136783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3928571429' to each side of the equation. 0.3928571429 + -0.3928571429 + x = -1.258136783 + -0.3928571429 Combine like terms: 0.3928571429 + -0.3928571429 = 0.0000000000 0.0000000000 + x = -1.258136783 + -0.3928571429 x = -1.258136783 + -0.3928571429 Combine like terms: -1.258136783 + -0.3928571429 = -1.6509939259 x = -1.6509939259 Simplifying x = -1.6509939259

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8652796401, -1.6509939259}

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